Letters disapearing

Glyphs
1

Hi

I have exported one of the fonts to ttf and it works perfectly.
Except when i type “fit” all lowercase it changes to “.t”.
This appears to only happen when I type “fi” in this order. the rest of the letters including also “if” works perfectly.
Another thing I noticed, When i am in illustrator and I use the glyphs menu it works, and when I type it it doesn’t.

Can someone help me resolve this please.
Am obviously not a pro using Glyphs software.

Thanks

2

It looks like that you have an empty fi ligature. Remove it and regenerate features and it should work.